Speaker
Description
In this talk, I will be talking about the CMS Run-2 search for dark matter produced in association with a dark Higgs boson decaying into a bottom quark-antiquark pair. The search is performed with proton-proton collision data at a center-of-mass energy of 13 TeV, taken during the 2016-2018 data-taking period, and corresponds to an integrated luminosity of 138 fb^{-1}. The results are interpreted in terms of a theoretical model that predicts the existence of a Higgs-boson-like particle in the dark sector (i.e. a dark Higgs boson), together with a spin-1 gauge boson mediator. The experimental signature consists of a large missing transverse momentum from dark matter production and a resonant structure in the invariant mass of the bottom quark-antiquark pair from the dark Higgs boson decay. Upper limits at 95% confidence level on the signal strength for dark Higgs boson mass hypotheses below 160 GeV are set. Values of the mediator mass up to 4.5 (2.5) TeV are excluded for a dark Higgs boson mass of 50 (150) GeV, which represents the most stringent limits set to date.